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Smartwool Apparel Size Guide This SmartWool® NTS Mid 250 Zip T Top is the perfect baselayer for the battle against frigid temperatures. Form fit has a modern cut that follows the contours of the body. Interlock knit fabrication. UPF 50+ protection during outdoor activity. Zip-through stand collar extends warmth and protection. Long sleeves. Three-quarter front zip. Shoulder panels eliminate top shoulder seams. Flatlock seam construction designed to eliminate chafing. Little Guy™ logo at left cuff. 100% merino wool. Machine wash warm, tumble dry low. Imported. Measurements: Length: 30 in Product measurements were taken using size MD. Please note that measurements may vary by size.